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A 65nm CMOS Front-end LNA for Medical Ultrasound Imaging with Feedback Employing Noise and Distortion Cancellation
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

A high performance 67.2uW low power front-end Low Noise Amplifier (LNA) for ultrasound applications is proposed. The amplifier utilizes a balun based on a common-gate (CG) and a common-source (CS) combination. The CS-amplifier performs error correction, and thus cancels distortion and noise from the CG-amplifier. The proposed design introduces a GM-boosted CG-amplifier for further linearization and HD2-supression. Furthermore, a programmable-gain scheme has been introduced. The amplifier is tailored towards a capacitive micro machined ultrasonic transducer (CMUT), with an impedance of 10k<-60 at a center of frequency 5MHz. Layout for the amplifier is created, and the LNA is design and simulated under 65nm CMOS including layout effects. Consequently, achieving a noise figure (NF) of only 2.98dB with a total power consumption of only 67.2uW, with an input impedance of 3k8. The final design sports a dynamic range (DR) of 50.35dB. Total harmonic distortion is simulated to -62.43dB with an IM3 of -41.47dB and HD2 of -56.63dB.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2013. , 85 p.
URN: urn:nbn:no:ntnu:diva-22064Local ID: ntnudaim:9836OAI: diva2:646802
Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2013-09-09Bibliographically approved

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